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linux-next/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt
Ivan T. Ivanov 6128440502 i2c: qup: Add device tree bindings information
The Qualcomm Universal Peripherial (QUP) wraps I2C mini-core and
provide input and output FIFO's for it. I2C controller can operate
as master with supported bus speeds of 100Kbps and 400Kbps.

Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
[bjorn: reformulated part of binding description
        added version to compatible
        cleaned up example]
Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Acked-by: Rob Herring <robh@kernel.org>
[wsa: removed the dummy child node which was a confusing example]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2014-03-28 23:41:26 +01:00

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Qualcomm Universal Peripheral (QUP) I2C controller
Required properties:
- compatible: Should be:
* "qcom,i2c-qup-v1.1.1" for 8660, 8960 and 8064.
* "qcom,i2c-qup-v2.1.1" for 8974 v1.
* "qcom,i2c-qup-v2.2.1" for 8974 v2 and later.
- reg: Should contain QUP register address and length.
- interrupts: Should contain I2C interrupt.
- clocks: A list of phandles + clock-specifiers, one for each entry in
clock-names.
- clock-names: Should contain:
* "core" for the core clock
* "iface" for the AHB clock
- #address-cells: Should be <1> Address cells for i2c device address
- #size-cells: Should be <0> as i2c addresses have no size component
Optional properties:
- clock-frequency: Should specify the desired i2c bus clock frequency in Hz,
defaults to 100kHz if omitted.
Child nodes should conform to i2c bus binding.
Example:
i2c@f9924000 {
compatible = "qcom,i2c-qup-v2.2.1";
reg = <0xf9924000 0x1000>;
interrupts = <0 96 0>;
clocks = <&gcc GCC_BLSP1_QUP2_I2C_APPS_CLK>, <&gcc GCC_BLSP1_AHB_CLK>;
clock-names = "core", "iface";
clock-frequency = <355000>;
#address-cells = <1>;
#size-cells = <0>;
};